Shenzhen ZhongNuo Testing Technology Co., Ltd. specializes in the calibration, certification, and metrological services for gas alarms, combustible gas detectors, toxic and harmful gas detectors, and other equipment in various locations. We provide services nationwide, addressing various electrical safety and explosion-proof fire prevention issues for clients, and contributing to safe production.
Which gas detectors require regular calibration and verification?
Fixed-install, handheld, and portable gas detectors, gas alarm instruments, toxic and harmful gas detectors/alarm systems, flammable gas detectors with alarms, gas analyzers, etc.

What information is included in the calibration report for a flammable gas detector?
The verification results should be reflected in the verification certificate or report. The verification proof or report must include the following information.
① Title, such as "Calibration Certificate" or "Calibration Report";
② Laboratory Name and Address
③ Calibration Location (if not calibrated in the laboratory)
④ Certificate or report (e.g., numbered), with page numbers and total page count indicated on each page
Please provide the company name and address for shipment.
⑥ Describe the target school clearly and explicitly.
Calibration date and receipt date;
⑧ Technical specifications for calibration basis, including names and codes;
Description of traceability and effectiveness of the measurement standards used for calibration.
⑩ Description of Calibration Environment
11. Calibration Results and Measurement Uncertainty Statement
12. Signature, title, or equivalent symbol of the issuer of the calibration certificate or report, and the issuance date;
13. Calibration results are only applicable to the calibration object.
14. No part of the certificate or report may be copied without written consent from the laboratory.
Reproofreading interval
The recalibration period for instruments is typically one year, to be determined by the submitting unit based on actual usage. During the re-calibration process, if there are any doubts about the instrument's test data, or if the main components of the instrument are replaced, as well as after repairs, a re-calibration is required.

Flammable and toxic/hazardous gas detectors calibration and verification in accordance with standards:
GB/T50493-2019 Standard for Design of Detection and Alarm Systems for Flammable Gases and Toxic Gases in Petroleum and Chemical Industry
GB12358-2006 General Technical Requirements for Environmental Gas Detection and Alarm Instruments in Workplace
JJG 693-2011 "Regulation for Calibration of Flammable Gas Detectors"

Appearance and structure
The instrument should not have any appearance damage that affects its normal operation. The surface of newly manufactured instruments should be smooth and clean, with even paint and plating coatings, and free from peeling and rusting.
The instrument's connections are reliable, and all knobs or buttons should operate and control normally.
Logos and Branding
Instrument name, model, manufacturer, production date, serial number, explosion-proof markings and numbers, as well as the manufacturing metrological instrument license mark and number for domestically manufactured instruments should be clear.
Shenzhen ZhongNuo Testing Technology Co., Ltd. is a third-party institution specializing in electrical safety, electrical explosion-proofing, gas alarms, and toxic and harmful gas alarm instruments for regular inspections, metrological measurements, and calibrations. We provide资质 to address fire and explosion prevention issues for our clients.